Mr. Jobs’ words about opening up Mobile OS X to 3rd-party developers:
You don’t want your phone to be an open platform, you need it to work when you need it to work. Cingular doesn’t want to see their West Coast network go down because some application messed up.
First of all, assuming the techincal implications of this are true (because they simply aren’t), whose fucking bone-headed idea was it to tie the phone up specifically to Cingular in the first place? The only feature I can see that is directly tied to Cingular’s network would be the visual voice-mail feature – unless another bone-headed decision was made to even use Cingular’s network for connecting to the internet as a whole (which is highly unlikely).

